Telephone repeating apparatus and circuits.



U. ADAMS-RANDALL.

TELEIHONE REPEATING APPARATUS AND GIRGUITS. Y

APPLICATION TILED MAB..13, 1911.

Patented Feb. 13, 1912.

avwewtox W- Z MMW r -fl/bbowaq wwmm c To all whom it may concern: coils ofa repeater-'26 and is connected with 55 Be it known that I, CHARLES ADAMS-RAN- the condenser 27 as shown. The said eon- DALL, a citizen of the United States, residing denser is joined by the wire 28 to the reat New York, in the county of New-York ceiver 29 at a distant station, and said reandMState of New York, have invented cerceiver is'joined by the wire 30 to a contact tain new and useful Improvements in Tele- 31 co-acting with the usual book 32, which 60 phone Repeating Apparatus and Circuits; in turn is joined by the wire 33 to one end and I do hereby declare the following to be of the secondary 34 of the induction coil 35.

a full, clear, and exact description of the in- The other end of said induction coil is joined vent-ion, such as will enable others skilled in by the wire 36 to one end of the secondary the art to which it appertains to make and .37 of the induction coil 38, while the other 65 use the same. j end of said secondary 37 is joined by the This invention relates to telephone rewire 39 to the contact 40 under 1' c control peating apparatus and circuits, and has for of the armature 41 of the controller 25.

its object to improve the transmission in Assoclated with the contact 40 is an adjustthose toll lines which are usually connected able contact point42 joined as at the point 70 in manually at the switch-board. 44 by the wire 43 to the wire 14.

With these and other objects in view, the 45 and 46 represent variable contacts uninvention consists in the novelarrangement der the control of the repeater 26, and the of circuits'and apparatus more fully hereincontact member 45 is joined by the Wire 47 after disclosed and particularly pointed out to the contact member 48 associated with 75 i th l i the contact member 49 under the control of Referring to the accompanying illustrathe armature 41 of the controller 25, and r tions forming a part of this specification, Said contact member 49 is joined by the wire the figure is a diagrammatic view of an ar- 50 to the local battery 51 which in turn is rangement of circuits and apparatus illus- 1ned by the w re 52 to one end of the pri- 8o t ti f my i ti maryt 53 of the dndllOlIlOIl c011 38, while the 1 indicates any suitable transmitter, 2 a o her end of said primary is joined by the source of current connected therewith, and re 4 t0 the Contact member 46 of the re- 3 the primary of an'induction coil4 of which peater 26.

5 is the secondary.' The operatlon of my improved system is 85 6 represents the usual hook supporting as follows :A person at the station A wish the receiver at a calling station, and 7 a conlng toljig/onverse with person at the station E tact co-acting with said hook. af er calling in the usual way simply takes 8 represents a y itabl for f receiver, the recelver 8 off of the hook 6, whereupon 9 a connection between one end of the secsaid. hook will automatically c ose the cir- 90 oinlary 5 and the said hook 6, and 10 a con cultrat the contact point 7, and current will nection between the contact 7 and the point flow from the battery 13 along the wire 14 11 on the main line 12. through the coilsof the relay 15, to and 13 represents a main battery connected to through the .secondary f the induction coil the wire 14 passing through the coils of the 4, along the wire 9, the said hook 6, contact relay 15 and joining the other end of the 7, w1re 10, connection 18, impedance 16 and secondary 5, asshown. The said battery 13 wire 17 back to the battery 13. Current is also connected with the impedance 16 by flowing through the relay 15 will cause its- 45 the wire 17, as illustrated. The said imarmature 23 to close circuit at the contact 21,

pedance 16 is also joined to the point 11 by whereupon current will flow from the local the connection 18. battery 20 along the wire 22 across the con 20 represents a local battery, joined to the tact 21, along the armature 23, and along contact 21 by the wire 22, and 23 represents the yvire 24, through the coils of the conthe armature of the relay 15 joined by the troller 25 and back to the battery 20. Curwire 24 passing'through the coils of the rents passing through the coils of the 0011- 10-5 controller 25 and completing the circuit with troller 25 will cause ifs armature 41 to close the battery 20. i the circuit at the contacts 40 and 49, as illus- The" main line wire 12 passes through the UNITED sTATEs PATENT OFFICE.

CHARLES ADAMS-RANDALL, OF NEW YORK, N. Y., ASSIGNOR TO RANDALL TELEPHONE MANUFACTURING COMPANY, OF AUGUSTA, MAINE, A CORPORATION OF MAINE.

TELEPHONE REPEATING APPARATUS AND CIRCUITS.

Specification of Letters Patent.

Application filed March 13, 1911.

trated, and the system will be ready for.

conversation. The transmitter l at station A may be now talked into, and induced currents from the secondary 5 will traverse the wire 9, lever 6, contact 7, wire 10, main line wire 12, coils of the repeater 26, and flow into the condenser 27. Similar currents will leave the condenser 27, traverse the wire 28, receiver 29 at the distant station B, wire 30, contact 31, hook lever 32, wire 33, secondary 34, wire 36, secondary 37, wire 39, contact members 40 and 42, wire 43 to the point 44, and thence over the wire 1.4 back to the "secondary 5 of the induction coil 4. These voice caused currents traversing 'the receiver '29 will of course, reproduce the original speech in said receiver. These currents also traversing the repeater 26 will vary the resistance between the contact members 45 and 46, and thereuponvary -the current flowing from the battery 51 through said contacts, and through the primary 53 of the induction coil 38. These latter variable currents corresponding to the original voice caused currents will react upon the secondarj 370i the said coil 38, and thereupon induce in said secondary 37 additional currents corresponding to the original voice caused currents, which will strengthen the latter and cause the speech to become clearer in the receiver 29. In all casds it is desirable to havea calling circuit (not shown) between the two stations, which calling circuits may be of any suitable and well known character, and when the call is received, of course, each party takes his receiver off ot'its respective hook, and thereupon brings the circuits into the condition illustrated. 'Should it be desired to talk from the station B to the station A, a call is made as before, whereupon the listener at the station A takes his receiver 8 oft of the book 6, and brings the circuits into theit'condition shown. Thereupon the person talking at the station B may utter words into the transmitter 60 and cause currents from the battery 61 to traverse the secondary 62 of the coil 35.

These currents will cause similar currents to leave one end of the coil 34, to flow along the wire 36, the secondary 37, the wire 39, the contact members 40 and 42, wire 43, to the point 44, wire 14, secondaryaz'i, wire 9, hook 6, contact 7, wire 10, point 11, main line wire 12 and coils of therepeater 26 into the condenser 27. Similar currents will flow out of the condenser 27 along the wire 28, receiver 29, wire 30, contact 31, lever 32, and wire 33, back to the oth'einend of the said secondary 34. In like manner, these voice caused currents in traversing the coils ofthe repeater 26 will cause similar currents to flow from the battery 50 through the primary 53, and these latter currents in the primary 53 will induce similar currents in the secondary 37 of the coil :38, which will render the speech clearer in the receiver 8 at the station A.

lVhen the receivers are on the hooks, of course, all circuits are broken, as will be apparent from the drawings.

l t is obvious that those skilled in the art may vary the arrangement of parts without departing from the spirit of my invention, and therefore I do not wish to be limited to the disclosure-above except as may be required by the claims.

hat I claim is 2- 1. In a telephone system, the combination of a main line metallic circuit; a condenser in series in said circuit; a repeater coil in series in one side of said circuit; a coil in series in the other side of said circuit; a local repeating circuit having a coil in inductive relation to said second mentioned coil, and magnetic means for making and breaking said local circuit, substantially as described.

2. In a telephone system, the combination of a main line metallic circuit; magnetic means for making and breaking said circuit; means at one of the terminals of said circuit for controlling said magnetic means; a repeater coil in seriesin one side of said circuit; a coil in series in the other side of said circuit; and a local repeating circuit having a coil in inductive relation to said secpnd mentioned coil, substantially as described.

3. In a telephone system, the combination of a main line metallic circuit; magnetic means for making and breaking said circuit; a relay for controlling said magnetic means; means located at one of the terminals of said circuit adapted to control said relay; a repeater coil in series in one side of said circuit; a coil in series in the other side of said circuit; and a local repeating circuit having a coil in inductive relation to said second mentioned coil, substantially as described.

4. In a telephone system, the combination of a main line circuit; a controller for making and breaking said circuit; a relay and circuit controlled. from one of the terminals of said circuit for operating said controller;

peater coil in series with one side of said main line circuit; a local repeating circuit in inductive relation with said main line circuit; and a coil associated with said local circuit in series in the other side of said main line circuit, substantially as described.

5. In a telephone system, the combination of a main line circuit; a condenser in series with said circuit; a controller for making and breaking said circuit; a relay and circuit for operating said controller actuated from one of the terminals at will; an im- I an impedance in said relay circuit; a re-' pedance in said relay circuit; a repeater coil in series with one side of said main line cincuit; and a local repeating circuit in inductive relation with the other side of said main line circuit, substantially as described.

6. In a telephone system, the combination of a mainline circuit; a plurality of manually controlled contacts for making and i other side of said main line circuit, substanl0 breaking said circuit; a eondensr in series 1 tial-ly as described.

in said circuit; a controller for making and In testimony whereof, I altix my signabreaking said circuit; a relay and circuit for ture, in presence of two witnesses.

operating said cpntroller; an impedance in CHARLES ADAMSRANDALL sald relay circuit; a repeater 0011 in serles with one side of said main line circuit; and Witnesses:

a local repeating circuit governed by said 1.1V SMITH,

cuntroller in inductive relation with the FREDERICK B. BLACKMAR. 

